libsexy: fix long help text lines

Make it depend on libgtk2 while we're at it.

package/libsexy/Config.in

@@ -1,6 +1,10 @@
 config BR2_PACKAGE_LIBSEXY
 	bool "libsexy"
+	depends on BR2_PACKAGE_LIBGTK2
 	help
-	  libsexy is a collection of GTK+ widgets that extend the functionality of such standard widgets as GtkEntry and GtkLabel by subclassing them and working around the limitations of the widgets.
+	  libsexy is a collection of GTK+ widgets that extend the
+	  functionality of such standard widgets as GtkEntry and
+	  GtkLabel by subclassing them and working around the
+	  limitations of the widgets.
 
 	  http://www.chipx86.com/wiki/Libsexy